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Discussion Starter · #1 ·
1983 merc 25hp
Runs reasonably well. There are some idle issues that I've been trying to work on. I have replaced the spark plugs a couple of times now. After maybe 6-8 trips they look like this. When I change them the motor runs much better. I've never seen an outboard do this before. Any ideas? I am using the plug that is recommended for the motor. Almost like they are running too hot?

These plugs were new a month ago:
 

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Brandon, FL
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11,117 Posts
Looks like the plug if firing fine but you are getting water under the cowl- either from spray or when washing.

Clean everything and spray it with a corrosion inhibitor.
 

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I Love microskiff.com!
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135 Posts
Everything duckNut said plus look for a stainless steel equivalent plug

Looks like the plug if firing fine but you are getting water under the cowl- either from spray or when washing.

Clean everything and spray it with a corrosion inhibitor.
 

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7,525 Posts
Also check for a gasket leak/bleed dripping from top to bottom.
I've had that happen between the water cover and cylinder head.
Salt deposits will lead to the source.
 
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